A novel thin solid electrolyte film and its application in all-solid-state battery at room temperature
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A thin Li7La3Zr2O12 (LLZO) film of several micrometers was prepared by a novel method, which underwent the changes from micro-sized particles, nanoparticle slurry, and the final thin film. The LLZO film exhibited a high stability with metallic Li. The all-solid-state battery was composed by Li metal anode, a mixture cathode (LiCoO2 and LLZO), and the solid electrolyte of a composite of LLZO and LITFSI film. At room temperature, the Li/composite of LLZO and LITFSI/LCO cell showed a discharge capacity of 119.3 mAh g−1 at a current density of 0.21 mA cm−2 after 45 cycles, which was approximately 100% of that of the second cycle. Electrochemical impedance spectroscopy showed the reduction of the radius in low-frequency semicircle, demonstrating an improvement of interfacial contact between LLZO and LCO during the cycling.
KeywordsAll-solid-state batteries Lithium batteries Solid electrolytes Garnets Membranes
This work was financially supported by the Strategic Priority Research Program of the Chinese Project Academy of Science (No. XDA09010201), the China Postdoctoral Science Foundation (Grant No. 2015M570529), the Ningbo 3315 International Team of Advanced Energy Storage Materials, the Zhejiang Province Key Science and Technology Innovation Team (Grant No. 2013TD16), and the National Natural Science Foundation of China (Grant No. 51371186).
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